ITGUY46 - Editorial

editorial
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1

Problem: Contest Page | CodeChef

DIFFICULTY:

EASY.

PROBLEM:

Chef has an old machine if the chef enters any natural number, the machine will display 1, 2, …n, n-1, n-2, n-3,…1 series and in next line prints sum of squares of each number in the series. Chef wants to create a computer program which can replicate the functionality of the machine. Help the chef to code.

Program:

#include<bits/stdc++.h> 
using namespace std; 
#define ll long long
 
int main() 
{ 
	ios_base::sync_with_stdio(false);
   	cin.tie(NULL);
   	cout.tie(NULL);
   	int sum,t,n;
   	cin>>t;
   	while(t--){
   		cin>>n;
   		sum=0;
   		sum=n*n+(n*(n-1)*(2*n-1))/3;
   		cout<<sum<<endl;
   	}
}